Mulungu Loth S, Makundi Rhodes H, Massawe Apia W, Leirs Herwig
Pest Management Centre, Sokoine University of Agriculture, Morogoro, TanzaniaUniversity of Antwerp, Evolutionary Biology Group, Antwerpen, BelgiumDanish Pest Infestation Laboratory, University of Aarhus, Department of Integrated Pest Management, Kongens Lyngby, Denmark.
Integr Zool. 2007 Sep;2(3):131-135. doi: 10.1111/j.1749-4877.2007.00051.x.
In this study we aimed to determine the relationship between sampling intensity and precision for estimating rodent damage. We used the systematic row sampling technique to provide data to achieve precision and accuracy in estimations of rodent damage in maize fields at the planting and seedling stages. The actual rodent damage to maize in 15 fields, each 0.5 ha in size, in Morogoro, Tanzania, was established at the seedling stage. These data were used to simulate the sampling intensities that would provide precision and accuracy. The variations between estimates were plotted against the sampling intervals. The results of this study show that the relationship between average standardized variances and sampling intervals is linear. The heterogeneous distribution of damage in some plots caused variations in the accuracy of the estimates between plots, but a sampling interval of five rows consistently produced estimates with a variance of less than 10%. We provide a standard curve that will allow a decision to be made on the sampling intensity as a function of required precision using the systematic row sampling technique in maize fields.
在本研究中，我们旨在确定抽样强度与估算啮齿动物损害精度之间的关系。我们采用系统行抽样技术来提供数据，以在种植和幼苗期对玉米田中的啮齿动物损害进行精确且准确的估算。在坦桑尼亚莫罗戈罗，对15块面积均为0.5公顷的田地中的玉米实际遭受的啮齿动物损害情况，在幼苗期进行了确定。这些数据被用于模拟能够提供精确性和准确性的抽样强度。将估算值之间的差异与抽样间隔进行了绘图。本研究结果表明，平均标准化方差与抽样间隔之间的关系是线性的。某些地块中损害的不均匀分布导致了不同地块估算精度的差异，但每隔五行的抽样间隔始终能产生方差小于10%的估算值。我们提供了一条标准曲线，可据此根据所需精度，利用系统行抽样技术来决定玉米田中的抽样强度。
